CiliumLocalRedirectPolicy addressMatcher allows cross-namespace service traffic hijacking and can break service translation

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-53935
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-07 21:17:27 UTC
Updated2026-07-10 17:56:00 UTC
DescriptionCilium is a networking, observability, and security solution. Prior to 1.17.16, from 1.18.2 to 1.18.9, and from 1.19.0 to 1.19.3, users with the ability to create CiliumLocalRedirectPolicies can specify arbitrary ClusterIPs via addressMatcher, enabling hijacking traffic to Services in any namespace and bypassing namespace scoping enforced by serviceMatcher; deleting such a policy can also corrupt Cilium internal service state and stop service translation for the affected Service. This issue is fixed in versions 1.17.16, 1.18.10, and 1.19.4.

Risk And Classification

Primary CVSS: v3.1 6.9 MEDIUM from [email protected]

CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H

EPSS: 0.003410000 probability, percentile 0.262130000 (date 2026-07-12)

Problem Types: CWE-863 | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.9MEDIUMCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H
3.1CNADECLARED6.9MEDIUMCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
High

CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cilium Cilium affected < 1.17.16 Not specified
CNA Cilium Cilium affected >= 1.18.2, < 1.18.10 Not specified
CNA Cilium Cilium affected >= 1.19.0, < 1.19.4 Not specified

References

ReferenceSourceLinkTags
github.com/cilium/cilium/commit/81d446395673dc2c684c047c12715caffac1a351 [email protected] github.com
github.com/cilium/cilium/pull/45585 [email protected] github.com
github.com/cilium/cilium/commit/92ca32eda85aa0c7611c28221cc26fa08be17ebc [email protected] github.com
github.com/cilium/cilium/commit/fe7eb53c7aac9fa7ec610b1975d73fbbb198c66d [email protected] github.com
github.com/cilium/cilium/security/advisories/GHSA-q6h5-q3q6-f87x [email protected] github.com
github.com/cilium/cilium/pull/45412 [email protected] github.com
github.com/cilium/cilium/pull/45584 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report